IHG-1 increases mitochondrial fusion and bioenergetic function.
Diabetes
; 63(12): 4314-25, 2014 Dec.
Article
em En
| MEDLINE
| ID: mdl-25008184
ABSTRACT
Induced in high glucose-1 (IHG-1) is a conserved mitochondrial protein associated with diabetic nephropathy (DN) that amplifies profibrotic transforming growth factor (TGF)-ß1 signaling and increases mitochondrial biogenesis. Here we report that inhibition of endogenous IHG-1 expression results in reduced mitochondrial respiratory capacity, ATP production, and mitochondrial fusion. Conversely, overexpression of IHG-1 leads to increased mitochondrial fusion and also protects cells from reactive oxygen species-induced apoptosis. IHG-1 forms complexes with known mediators of mitochondrial fusion-mitofusins (Mfns) 1 and 2-and enhances the GTP-binding capacity of Mfn2, suggesting that IHG-1 acts as a guanine nucleotide exchange factor. IHG-1 must be localized to mitochondria to interact with Mfn1 and Mfn2, and this interaction is necessary for increased IHG-1-mediated mitochondrial fusion. Together, these findings indicate that IHG-1 is a novel regulator of both mitochondrial dynamics and bioenergetic function and contributes to cell survival following oxidant stress. We propose that in diabetic kidney disease increased IHG-1 expression protects cell viability and enhances the actions of TGF-ß, leading to renal proximal tubule dedifferentiation, an important event in the pathogenesis of this devastating condition.
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Base de dados:
MEDLINE
Assunto principal:
Proteínas
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Nefropatias Diabéticas
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Metabolismo Energético
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Dinâmica Mitocondrial
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Mitocôndrias
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article